Flap bag



FIG. 1 is a front right perspective view of a flap bag showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the flap bag shown in broken lines represent thread stitching and do form a part of the claimed design. 

CLAIM The ornamental design for a flap bag, as shown and described. 